Top Questions About Aster Plants

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Questions About Aster Plants

Asked by
Anonymous on
October 26, 2011

Q. Aster Bushes

The aster bushes at our park have gotten some mildew (I think). It starts at the base and works its way upward, but the plant still blooms and is beautiful at the crown. Any input to help will be greatly appreciated.

Answered by
Nikki on
October 27, 2011
Certified Expert
A.

Treat the plant with a fungicide. We like neem oil, which is both an organic pesticide and fungicide. Here is more info: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm

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Asked by
sharney on
November 11, 2012

Q. Winterizing Asters

I’ve never had asters before. Do I treat them like mums? How to treat asters over winter.

Answered by
Nikki on
November 12, 2012
Certified Expert
A.

The hardy types do not require any special attention over winter. It does help to leave the foilage as added protection during winter freezes, or you can cover with mulch. Once new growth begins in spring, any old growth may be pruned back.

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Asked by
Anonymous on
May 28, 2014

Q. Stokes Aster Wilting

My Stokes asters are wilting from the top down and then melting. This is happening in several areas of the bed. This happened last year but it is worse this year. The area affected last year appears to have come back even after removing the stems of the wilted plants.

Answered by
Nikki on
November 30, -0001
Certified Expert
A.

Are they yellowing too? If so, your plants may be infected with fusarium wilt disease, which is common in asters and many other plants. Here is more information: https://www.gardeningknowhow.com/plant-problems/disease/controlling-fusarium-wilt.htm

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Asked by
MNist on
June 23, 2015

Q. Does asters yellow contaminate the soil?

I have a clear case of asters yellow in one of my favorite coneflowers. Of course, I will destroy it, but wonder if I can plant a new one in its spot next year? I would hate to keep losing plants.

Thanks.

Answered by
Downtoearthdigs on
June 23, 2015
Certified Expert
A.

From all the research I looked at, no it does not stay in the soil. It has to live in the host plant.
I think I would wait and make sure all the roots were gone from the location.
Here are a few articles.

https://www.gardeningknowhow.com/plant-problems/disease/aster-yellows-disease.htm
https://www.ag.ndsu.edu/cpr/plant-pathology/understanding-aster-yellows-7-26-12

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Asked by
Anonymous on
July 6, 2015

Q. annual asters wilting and dying

Why do my annual asters wilt and die just before getting ready to blossom, after being healthy for over a month?

Answered by
Downtoearthdigs on
July 7, 2015
Certified Expert
A.

Are they yellowing too? If so, your plants may be infected with fusarium wilt disease, which is common in asters and many other plants. Here is more information: https://www.gardeningknowhow.com/plant-problems/disease/controlling-fusarium-wilt.htm

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Asked by
lkeres322 on
August 10, 2015

Q. worms in asters

I found two worms, each in the flower bud of my perennial Aster plant. I pulled them out. How can I treat this problem? Will it spread to the entire plant? This is my first experience with the perennial Aster. It is in a partial sun/shade location. How should I feed it and do I need to spray for insects?

Answered by
shelley on
August 12, 2015
Certified Expert
A.

A photo would aid in my identification as there is a wide range of worm-like pests that attack asters including beet armyworms, cabbage loopers, carnation leafrollers, corn earworms, cutworms and omnivorous leaftiers. Hand picking the pests as you have done is typically recommended although some might advocate the use of Bacillus thuringiensis.

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Asked by
ToniaK on
August 31, 2015

Q. green asters do not bloom

I have beautiful, full green asters but they do not bloom. What am I doing wrong? When I originally purchased them, I believe in 2011, they bloomed in mid to late July. They are full and green ans otherwise appear “happy”. They do have tight closed buds. Am I just premature in asking and not waiting long enough? Also, should I be pruning them back? If so, when is the best time of year? Thanks in advance!

Answered by
Downtoearthdigs on
September 2, 2015
Certified Expert
A.

Aster's do generally bloom later in the summer but you may have an issue with to much Nitrogen in the soil.
This will cause lush green plants with little to no flowering.

By adding Phosphorous you can promote flowering. Bone Meal is a good way to do this.

Here are some links for you.

https://www.gardeningknowhow.com/ornamental/flowers/asters/growing-asters.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/bone-meal-fertilizer.htm

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